git.scottworley.com Git - vopamoi/blob - vopamoi.ts

   1 // Typescript doesn't know about MAX_SAFE_INTEGER??  This was supposed to be
   2 // fixed in typescript 2.0.1 in 2016, but is not working for me in typescript
   3 // 4.2.4 in 2022.  :( https://github.com/microsoft/TypeScript/issues/9937
   4 //const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER;
   5 const MAX_SAFE_INTEGER = 9007199254740991;
   6
   7 // A sane split that splits N *times*, leaving the last chunk unsplit.
   8 function splitN(str: string, delimiter: string, limit: number = MAX_SAFE_INTEGER): string[] {
   9   if (limit < 1) {
  10     return [str];
  11   }
  12   const at = str.indexOf(delimiter);
  13   return at === -1 ? [str] : [str.substring(0, at)].concat(splitN(str.substring(at + delimiter.length), delimiter, limit - 1));
  14 }
  15
  16 // A clock that never goes backwards; monotonic.
  17 function Clock() {
  18   var previousNow = Date.now();
  19   return {
  20     now: function (): number {
  21       const now = Date.now();
  22       if (now > previousNow) {
  23         previousNow = now;
  24         return now;
  25       }
  26       return ++previousNow;
  27     },
  28   };
  29 }
  30 const clock = Clock();
  31
  32 // Returns a promise for a hue based on a hash of the string
  33 function hashHue(str: string) {
  34   // Using crypto for this is overkill
  35   return crypto.subtle.digest("SHA-256", new TextEncoder().encode(str)).then((buf) => (new Uint16Array(buf)[0] * 360) / 2 ** 16);
  36 }
  37
  38 const Model = {
  39   addTask: function (timestamp: string, description: string): Element {
  40     const task = document.createElement("div");
  41     const desc = document.createElement("span");
  42     desc.textContent = description;
  43     desc.classList.add("desc");
  44     task.appendChild(desc);
  45     task.classList.add("task");
  46     task.setAttribute("tabindex", "0");
  47     task.setAttribute("data-created", timestamp);
  48     task.setAttribute("data-state", "todo");
  49     document.getElementById("tasks")!.appendChild(task);
  50     return task;
  51   },
  52
  53   addTag: function (createTimestamp: string, tagName: string): Element | null {
  54     const task = this.getTask(createTimestamp);
  55     if (!task) return null;
  56     const existingTag = this.hasTag(task, tagName);
  57     if (existingTag) return existingTag;
  58     const tag = document.createElement("span");
  59     tag.appendChild(document.createTextNode(tagName));
  60     tag.classList.add("tag");
  61     tag.setAttribute("tabindex", "0");
  62     hashHue(tagName).then((hue) => (tag.style.backgroundColor = `hsl(${hue},90%,45%)`));
  63     for (const child of task.getElementsByClassName("tag")) {
  64       if (tagName > child.textContent!) {
  65         task.insertBefore(tag, child);
  66         return tag;
  67       }
  68     }
  69     task.appendChild(tag);
  70     return tag;
  71   },
  72
  73   edit: function (createTimestamp: string, newDescription: string): Element | null {
  74     const target = this.getTask(createTimestamp);
  75     if (!target) return null;
  76     if (target.hasAttribute("data-description")) {
  77       // Oh no: An edit has arrived from a replica while a local edit is in progress.
  78       const input = target.firstChild as HTMLInputElement;
  79       if (
  80         input.value === target.getAttribute("data-description") &&
  81         input.selectionStart === input.value.length &&
  82         input.selectionEnd === input.value.length
  83       ) {
  84         // No local changes have actually been made yet.  Change the contents of the edit box!
  85         input.value = newDescription;
  86       } else {
  87         // No great options.
  88         // Prefer not to interrupt the local user's edit.
  89         // The remote edit is mostly lost; this mostly becomes last-write-wins.
  90         target.setAttribute("data-description", newDescription);
  91       }
  92     } else {
  93       target.getElementsByClassName("desc")[0].textContent = newDescription;
  94     }
  95     return target;
  96   },
  97
  98   hasTag: function (task: Element, tag: string): Element | null {
  99     for (const child of task.getElementsByClassName("tag")) {
 100       if (child.textContent === tag) {
 101         return child;
 102       }
 103     }
 104     return null;
 105   },
 106
 107   getPriority: function (task: Element): number {
 108     if (task.hasAttribute("data-priority")) {
 109       return parseFloat(task.getAttribute("data-priority")!);
 110     }
 111     return parseFloat(task.getAttribute("data-created")!);
 112   },
 113
 114   getTask: function (createTimestamp: string) {
 115     for (const task of document.getElementsByClassName("task")) {
 116       if (task.getAttribute("data-created") === createTimestamp) {
 117         return task;
 118       }
 119     }
 120   },
 121
 122   removeTag: function (createTimestamp: string, tagName: string) {
 123     const task = this.getTask(createTimestamp);
 124     if (!task) return null;
 125     const tag = this.hasTag(task, tagName);
 126     if (!tag) return;
 127     task.removeChild(tag);
 128   },
 129
 130   setPriority: function (createTimestamp: string, priority: number): Element | null {
 131     const target = this.getTask(createTimestamp);
 132     if (!target) return null;
 133     target.setAttribute("data-priority", `${priority}`);
 134     for (const task of document.getElementsByClassName("task")) {
 135       if (task !== target && this.getPriority(task) > priority) {
 136         task.parentElement!.insertBefore(target, task);
 137         return target;
 138       }
 139     }
 140     document.getElementById("tasks")!.appendChild(target);
 141     return target;
 142   },
 143
 144   setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
 145     const task = this.getTask(createTimestamp);
 146     if (task) {
 147       task.setAttribute("data-state", state);
 148     }
 149   },
 150 };
 151
 152 function Log(prefix: string = "vp-") {
 153   var next_log_index = 0;
 154   return {
 155     apply: function (entry: string) {
 156       const [timestamp, command, data] = splitN(entry, " ", 2);
 157       if (command == "Create") {
 158         return Model.addTask(timestamp, data);
 159       }
 160       if (command == "Edit") {
 161         const [createTimestamp, description] = splitN(data, " ", 1);
 162         return Model.edit(createTimestamp, description);
 163       }
 164       if (command == "Priority") {
 165         const [createTimestamp, newPriority] = splitN(data, " ", 1);
 166         return Model.setPriority(createTimestamp, parseFloat(newPriority));
 167       }
 168       if (command == "State") {
 169         const [createTimestamp, state] = splitN(data, " ", 1);
 170         return Model.setState(timestamp, createTimestamp, state);
 171       }
 172       if (command == "Tag") {
 173         const [createTimestamp, tag] = splitN(data, " ", 1);
 174         return Model.addTag(createTimestamp, tag);
 175       }
 176       if (command == "Untag") {
 177         const [createTimestamp, tag] = splitN(data, " ", 1);
 178         return Model.removeTag(createTimestamp, tag);
 179       }
 180     },
 181
 182     record: function (entry: string) {
 183       window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
 184     },
 185
 186     recordAndApply: function (entry: string) {
 187       this.record(entry);
 188       return this.apply(entry);
 189     },
 190
 191     replay: function () {
 192       while (true) {
 193         const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
 194         if (entry === null) {
 195           break;
 196         }
 197         this.apply(entry);
 198         next_log_index++;
 199       }
 200     },
 201   };
 202 }
 203 const log = Log();
 204
 205 function UI() {
 206   const undoLog: string[] = [];
 207   return {
 208     addTask: function (description: string): Element {
 209       const now = clock.now();
 210       undoLog.push(`State ${now} deleted`);
 211       return <Element>log.recordAndApply(`${now} Create ${description}`);
 212     },
 213     addTag: function (createTimestamp: string, tag: string) {
 214       undoLog.push(`Untag ${createTimestamp} ${tag}`);
 215       return log.recordAndApply(`${clock.now()} Tag ${createTimestamp} ${tag}`);
 216     },
 217     edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
 218       undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
 219       return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
 220     },
 221     setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
 222       undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
 223       return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
 224     },
 225     setState: function (createTimestamp: string, newState: string, oldState: string) {
 226       undoLog.push(`State ${createTimestamp} ${oldState}`);
 227       return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
 228     },
 229     undo: function () {
 230       if (undoLog.length > 0) {
 231         return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
 232       }
 233     },
 234   };
 235 }
 236 const ui = UI();
 237
 238 enum CommitOrAbort {
 239   Commit,
 240   Abort,
 241 }
 242
 243 function BrowserUI() {
 244   var currentViewState = "todo";
 245   var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
 246   var lastTagNameEntered = "";
 247   return {
 248     addTask: function (event: KeyboardEvent) {
 249       const input = <HTMLInputElement>document.getElementById("taskName");
 250       if (input.value.match(/^ *$/)) return;
 251       const task = ui.addTask(input.value);
 252       if (currentViewState === "todo") {
 253         task instanceof HTMLElement && task.focus();
 254       } else if (this.returnFocusAfterInput()) {
 255       } else {
 256         this.firstVisibleTask()?.focus();
 257       }
 258       input.value = "";
 259       if (event.getModifierState("Control")) {
 260         this.setPriority(task, null, document.getElementsByClassName("task")[0]);
 261       }
 262     },
 263
 264     beginEdit: function (event: Event) {
 265       const task = document.activeElement;
 266       if (!task) return;
 267       const input = document.createElement("input");
 268       const desc = task.getElementsByClassName("desc")[0];
 269       const oldDescription = desc.textContent!;
 270       task.setAttribute("data-description", oldDescription);
 271       input.value = oldDescription;
 272       input.addEventListener("blur", this.completeEdit, { once: true });
 273       desc.textContent = "";
 274       task.insertBefore(input, task.firstChild);
 275       input.focus();
 276       event.preventDefault();
 277     },
 278
 279     beginTagEdit: function (event: Event) {
 280       const task = document.activeElement;
 281       if (!task) return;
 282       const input = document.createElement("input");
 283       input.classList.add("tag");
 284       input.addEventListener("blur", this.completeTagEdit, { once: true });
 285       input.value = lastTagNameEntered;
 286       task.appendChild(input);
 287       input.focus();
 288       input.select();
 289       event.preventDefault();
 290     },
 291
 292     completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 293       const input = event.target as HTMLInputElement;
 294       const task = input.parentElement!;
 295       const desc = task.getElementsByClassName("desc")[0];
 296       const oldDescription = task.getAttribute("data-description")!;
 297       const newDescription = input.value;
 298       input.removeEventListener("blur", this.completeEdit);
 299       task.removeChild(input);
 300       task.removeAttribute("data-description");
 301       task.focus();
 302       if (resolution === CommitOrAbort.Abort || newDescription.match(/^ *$/) || newDescription === oldDescription) {
 303         desc.textContent = oldDescription;
 304       } else {
 305         ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
 306       }
 307     },
 308
 309     completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 310       const input = event.target as HTMLInputElement;
 311       const task = input.parentElement!;
 312       const newTagName = input.value;
 313       input.removeEventListener("blur", this.completeTagEdit);
 314       task.removeChild(input);
 315       task.focus();
 316       if (resolution === CommitOrAbort.Commit && !newTagName.match(/^ *$/) && !Model.hasTag(task, newTagName)) {
 317         ui.addTag(task.getAttribute("data-created")!, newTagName);
 318         lastTagNameEntered = newTagName;
 319       }
 320     },
 321
 322     firstVisibleTask: function () {
 323       for (const task of document.getElementsByClassName("task")) {
 324         if (task instanceof HTMLElement && task.getAttribute("data-state") === currentViewState) {
 325           return task;
 326         }
 327       }
 328     },
 329
 330     focusTaskNameInput: function (event: Event) {
 331       if (document.activeElement instanceof HTMLElement) {
 332         taskFocusedBeforeJumpingToInput = document.activeElement;
 333       }
 334       document.getElementById("taskName")!.focus();
 335       event.preventDefault();
 336     },
 337
 338     visibleTaskAtOffset(task: Element, offset: number): Element {
 339       var cursor: Element | null = task;
 340       var valid_cursor = cursor;
 341       const increment = offset / Math.abs(offset);
 342       while (true) {
 343         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 344         if (!cursor || !(cursor instanceof HTMLElement)) break;
 345         if (cursor.getAttribute("data-state")! === currentViewState) {
 346           offset -= increment;
 347           valid_cursor = cursor;
 348         }
 349         if (Math.abs(offset) < 0.5) break;
 350       }
 351       return valid_cursor;
 352     },
 353
 354     moveCursor: function (offset: number): boolean {
 355       const active = document.activeElement;
 356       if (!active) return false;
 357       const dest = this.visibleTaskAtOffset(active, offset);
 358       if (dest !== active && dest instanceof HTMLElement) {
 359         dest.focus();
 360         return true;
 361       }
 362       return false;
 363     },
 364
 365     moveTask: function (offset: number) {
 366       const active = document.activeElement;
 367       if (!active) return;
 368       const dest = this.visibleTaskAtOffset(active, offset);
 369       if (dest === active) return; // Already extremal
 370       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 371       if (onePastDest == dest) onePastDest = null; // Will become extremal
 372       if (offset > 0) {
 373         this.setPriority(active, dest, onePastDest);
 374       } else {
 375         this.setPriority(active, onePastDest, dest);
 376       }
 377     },
 378
 379     returnFocusAfterInput: function (): boolean {
 380       if (taskFocusedBeforeJumpingToInput) {
 381         taskFocusedBeforeJumpingToInput.focus();
 382         return true;
 383       }
 384       return false;
 385     },
 386
 387     // Change task's priority to be between other tasks a and b.
 388     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 389       const aPriority = a === null ? 0 : Model.getPriority(a);
 390       const bPriority = b === null ? clock.now() : Model.getPriority(b);
 391       console.assert(aPriority < bPriority, aPriority, "<", bPriority);
 392       const span = bPriority - aPriority;
 393       const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
 394       console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
 395       const newPriorityRounded = Math.round(newPriority);
 396       const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
 397       ui.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
 398       task instanceof HTMLElement && task.focus();
 399     },
 400
 401     setState: function (newState: string) {
 402       const task = document.activeElement;
 403       if (!task) return;
 404       const oldState = task.getAttribute("data-state")!;
 405       if (newState === oldState) return;
 406       const createTimestamp = task.getAttribute("data-created")!;
 407       this.moveCursor(1) || this.moveCursor(-1);
 408       return ui.setState(createTimestamp, newState, oldState);
 409     },
 410
 411     setView: function (state: string, color: string) {
 412       const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
 413       sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
 414       sheet.insertRule(`:root { --view-state-indicator-color: ${color}; }`);
 415       sheet.removeRule(2);
 416       sheet.removeRule(2);
 417       currentViewState = state;
 418       if (document.activeElement?.getAttribute("data-state") !== state) {
 419         this.firstVisibleTask()?.focus();
 420       }
 421     },
 422
 423     undo: function () {
 424       const ret = ui.undo();
 425       if (ret && ret instanceof HTMLElement) ret.focus();
 426     },
 427   };
 428 }
 429 const browserUI = BrowserUI();
 430
 431 enum InputState {
 432   Command,
 433   View,
 434 }
 435 var inputState = InputState.Command;
 436
 437 function handleKey(event: any) {
 438   if (event.target.tagName === "INPUT") {
 439     if (event.target.id === "taskName") {
 440       if (event.key == "Enter") return browserUI.addTask(event);
 441       if (event.key == "Escape") return browserUI.returnFocusAfterInput();
 442     } else if (event.target.classList.contains("tag")) {
 443       if (event.key == "Enter") return browserUI.completeTagEdit(event);
 444       if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
 445     } else {
 446       if (event.key == "Enter") return browserUI.completeEdit(event);
 447       if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
 448     }
 449   } else {
 450     if (inputState === InputState.Command) {
 451       if (event.key == "j") return browserUI.moveCursor(1);
 452       if (event.key == "k") return browserUI.moveCursor(-1);
 453       if (event.key == "J") return browserUI.moveTask(1);
 454       if (event.key == "K") return browserUI.moveTask(-1);
 455       if (event.key == "n") return browserUI.focusTaskNameInput(event);
 456       if (event.key == "c") return browserUI.setState("cancelled");
 457       if (event.key == "d") return browserUI.setState("done");
 458       if (event.key == "q") return browserUI.setState("todo");
 459       if (event.key == "s") return browserUI.setState("someday-maybe");
 460       if (event.key == "w") return browserUI.setState("waiting");
 461       if (event.key == "X") return browserUI.setState("deleted");
 462       if (event.key == "u") return browserUI.undo();
 463       if (event.key == "e") return browserUI.beginEdit(event);
 464       if (event.key == "t") return browserUI.beginTagEdit(event);
 465       if (event.key == "v") return (inputState = InputState.View);
 466     } else if (inputState === InputState.View) {
 467       inputState = InputState.Command;
 468       if (event.key == "c") return browserUI.setView("cancelled", "Red");
 469       if (event.key == "d") return browserUI.setView("done", "LawnGreen");
 470       if (event.key == "q") return browserUI.setView("todo", "White");
 471       if (event.key == "s") return browserUI.setView("someday-maybe", "DeepSkyBlue");
 472       if (event.key == "v") return browserUI.setView("todo", "White");
 473       if (event.key == "w") return browserUI.setView("waiting", "MediumOrchid");
 474       if (event.key == "x") return browserUI.setView("deleted", "Black");
 475     }
 476   }
 477 }
 478
 479 function browserInit() {
 480   log.replay();
 481   browserUI.firstVisibleTask()?.focus();
 482   document.body.addEventListener("keydown", handleKey, { capture: false });
 483 }